Propeller structure



1931- P. G. BENDER ET AL 1,835,372

PROPELLER STRUCTURE Filed June 20, 1930 3 Sheets-Sheet 1 I nvcnlor:

7 am! 6 .BQnder Halloe/r If Bend r" Allomey 1931- P. G. BENDER ET AL1,835,372

PROPELLER STRUCTURE Filed June 20, 1930 5 Sheets-Sheet 2IIIIIIII/III/III/II/ I I 32 9 l0 InvenlorJ Paul. 6' .Bnder Halloc/r r7.Bender A ilomey 1931- P. G. BENDER ET AL 7 PROPELLER ST RUCTURE FiledJune 20, 1930 3 Sheets-Sheet 5 Inventor;

0 Paul 6. Bender HaZZoc/r t7. Bender I 94mm A llorncy Patented Dec. 8,1931 UNITED STATES PATENT. OFFICE PROPELLER srnoorrrrnn Applicationfiled June 20,

This invention relates to an improved propeller construction especially,but not necessarily, adapted for use and association with aeronauticalconveyances, and especially airplanes.

The purpose of the invention is to provide a practical and feasibleorganization of parts for adjusting the companion blades or sections ofa two-part propeller which permits safer and more dependable control ofthe flight, to promote proper regulation of speed, and to otherwisefulfill the requirements of variable propeller adjustments.

In carrying the inventive conception into practice, we have elected andbrought into proper mechanical organization suitably matched andco-operable details presenting the requisite mechanical relationship toexpedite adjustment of the propeller blades from a single remote controlwithin convenient reach of the pilot or operator.

Our primary aim is to improve upon propeller constructions by providingan arrangement which is characterized by simplicity, economy, andfurther individualized by the presence of separable renewable andinterchangeable parts.

Other features, advantages, and objects will become more readilyapparent from the following description and drawings.

In the drawings:

Figure 1 shows a fragmentary portion of a motor provided with apropeller developed in accordance with the present inventive conception.

Figure 2 is a horizontal section taken approximately on the plane of theirregular line 22 of Figure 1.

Figure 3 is a true horizontal section on the line 33 of Figure 1, withportions shown in elevation.

Figure at is an enlarged cross section on the line 4.-4 of Figure 1.

Figures 5, 6, and 7 are detail views.

In the drawings, the motor is generally represented by the ordinal 8. Asshown in Figure 3, the numerals 9 designate a pair of spaced parallelguide bars fastened to and projecting outwardly beyond the end of themotor. Slidably mounted on these rods is a 1930. Serial No. 462,565.

two-part annulus 10 having'its body portion of chanmelshapedcrosssection to provide a bearing for rotatable reception of a collar 11.

Incidently, the numeral 12 designates a set screw for securing thepush-pull wire or rod 13 of the operating means to the collar. Thenumeral 14 designates a retention clip on the motor for holding in placethe flexible tube 15. The complete tube and rod as a unit constitutingthe operating means is gener- "to ally represented by the numeral 16.The operating end thereof is located within convenient reach of theoperator in the machine.

The numeral 17 designates generally a hub structure the tubular housingpart 19 of '65 which is keyed to the propeller shaft 18. This housing isprovided with diametrically opposite grooves 20 slidably receiving thelugs or shoes 21. These shoes are pivoted or otherwise fastened to therotating collar 11. v

Formed integral with the outer end of the body 19 is a laterallydirected half-section 22 of the propeller housing or casing 23. Thispart 22.is substantially semi-circular in cross section and isassociated with the complemental section 24. Both of these sections areprovided with fianges suitably secured together as shown in Figure 1.

The numerals 25 in Figure 3 designate arcuate guide slots. Thissubstantially cir- 8'0 cular housing 23 accommodates the stem portions26 of the companionsection 27 and 28 of the two-part propeller. Theseparts 27 and 28 may bedesignated as the twisted blade portion of thepropeller. The stem por- '85 tions thereof are formed with abuttingheads 29 eachof which is provided with a kerf 30 (see Figure ,7) toaccommodate the operating arm 31 (see Figure These arms 31 extend inopposite directions and pass through the slots 25.

- These projecting ends are pivotally connected with the adjacent forkedends of the links 32 located on diametrically opposite sides of the hubstructure. The links converge inwardly and are pivotally connected attheir inner ends with the projecting end portions of the aforesaidslides or shoes 21.

It is understood that the relatively stationary parts of this structureare the guide "7100 rods 9 on the motor block 8 together with theannular slidable bearing 10 carried by these rods. The shaft 18 and itshousing 19 are rotatable as are the shoes 21 and the ring or collar 11carried thereby. The shoes, collar, and annular bearing form theslidable unit which under the control of the operating device 16 may bemoved in or out with respect to the motor block.

Through the medium of the link connections 32 and the complemental arm31,- the sections 27 and 28 of the propellermay be turned as a unit inthe casing 23, thus" per: mitting the angularity of these companionparts 27 and 28 to be regulated according to variable flight conditions.h e 7 It is thought that persons skilled in the art to which theinvention relates will be able to obtain a clear understanding of theinvention after considering the description in connec'tion with thedrawings. Therefore, a more lengthy description is regarded as unnecessary. v

Minor changes in shape, size, and rearrangement of detailscoming withinthe field of invention claimed may be resorted to in actual practice ifdeisred;

lVe claim:

a In a structure of the class described, in combination, a motor block,a pair of spaced parallel guide rods secured to and projecting outwardlyfrom the block, a rotary propeller shaft projecting outwardly from theblock and disposed intermediate said guide rods, an annular bearingslidably mounted on said guide rods, a hub keyed on said shaft, said hubhaving grooves formed therein, shoes slidable in said grooves, a col larsurrounding the hub and fastened to said shoes and mounted for rotationin said hearing, said hub including a right-singularly disposed bearingforming casing, a pair of pro pellers including stem portions mountedfor oscillation in said bearing casing, and operating means connectedwith said stem portion, each stem having a head at itsinner end providedwith a kerf, anarm fastened in each kerf, said arms extending inopposite direc'- tions, and said bearing casing having upper and lowerslots therein through which the arms pass, and links pivotally connectedwith the outer ends of said arms and with adjacent end portions of saidshoes, and a remote control device operatively connected with saidbearing for moving it in and out on said rods for effecting oscillatoryadjustment of the propeller blades.

In testimony whereof 'we aflix our signatures. K

PAUL G. BENDER HAL-LOCK J. BENDER;

